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Explain why xylem transport is unidirectional and phloem transport bidirectional.

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Food, primarily sucrose, is transported by the vascular tissue phloem from a source to a sink. Usually, the source is understood to be that part of the plant which synthesizes the food and sink, the part that needs or stores the food. But, the source and sink may be reversed depending on the plant’s needs. Sugar stored in roots may be mobilised to become a source of food in the early spring when the buds of trees, act as sink; they need energy for growth and development of the photosynthetic apparatus. Since the source-sink relationship is variable, the direction of movement in the phloem can be bi-directional. This contrasts with that of the xylem where the movement is always unidirectional.

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